Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-20-171375-index-headers.html | 2020-06-17 16:31:40 | |
| 0001193125-20-171375-index.html | 2020-06-17 16:31:40 | |
| 0001193125-20-171375.txt | 2020-06-17 16:31:40 | |
 0001193125-20-171375-xbrl.zip | 11503 | 2020-06-17 16:31:40 |
| btu-20200611.xsd | 3082 | 2020-06-17 16:31:40 |
| btu-20200611_lab.xml | 17374 | 2020-06-17 16:31:40 |
| btu-20200611_pre.xml | 10962 | 2020-06-17 16:31:40 |
| d947010d8k.htm | 35580 | 2020-06-17 16:31:40 |
| d947010d8k_htm.xml | 3276 | 2020-06-17 16:31:40 |
| d947010dex991.htm | 3689 | 2020-06-17 16:31:40 |
| FilingSummary.xml | 1729 | 2020-06-17 16:31:40 |
| Financial_Report.xlsx | 5787 | 2020-06-17 16:31:40 |
 g947010g0617181620135.jpg | 3080 | 2020-06-17 16:31:40 |
| MetaLinks.json | 18330 | 2020-06-17 16:31:40 |
| R1.htm | 38615 | 2020-06-17 16:31:40 |
| report.css | 2767 | 2020-06-17 16:31:40 |
| Show.js | 1085 | 2020-06-17 16:31:40 |